215140254240 has 96 divisors (see below), whose sum is σ = 690478520256. Its totient is φ = 56288261120.

The previous prime is 215140254239. The next prime is 215140254247. The reversal of 215140254240 is 42452041512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215140254198 and 215140254207.

It is not an unprimeable number, because it can be changed into a prime (215140254247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4202946 + ... + 4253825.

It is an arithmetic number, because the mean of its divisors is an integer number (7192484586).

Almost surely, 2^215140254240 is an apocalyptic number.

215140254240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215140254240 is an abundant number, since it is smaller than the sum of its proper divisors (475338266016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215140254240 is a wasteful number, since it uses less digits than its factorization.

215140254240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8456842 (or 8456834 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 215140254240 its reverse (42452041512), we get a palindrome (257592295752).

The spelling of 215140254240 in words is "two hundred fifteen billion, one hundred forty million, two hundred fifty-four thousand, two hundred forty".